Pulverizing mill



Apr. l?, i923.

R. E. H. POMEROY Apr. 17, 1923.

R. E. H. POMEROY PULVERI ZING MILL Filed Jan. 18 '1923 2 Sheets-Sheet 2 Invent au Patented Apr. l?, i923.

ly'tltmit ATENT @FFHCEQ RALPH E. H. POMROY, 0F CANTON, OHlU.

PULVERIZING MILL.

application led January 18, 1923. Serial t'o. 613,348.

which air for the removal from the pulverl izer of particles reduced to the desired size is introduced at one end of the pulverizlng drum, preferably adjacent tothe lnner periphery and escapes laden with dust from the same end of the drum. ln the specliic embodiment of the improvement described and shown-in the above application, the air enters at a plurality of points around the pev riphery and flows inwardly towards the axis of the drum. The invention described herein has for its object the provision of means for determining' the sectors of the drum at which the air will enter and leave the drum, the flow of air into and from `the drum being in reverse directions as in the application above referred to. The invention is hereinafter more fully described and claimed.

In the `accompanying drawings forming a part of-this specification, Fig. 1 1s a perspective View of a pulverizer, embodying the improvements claimed herein, and F 1g. 1s a plan view Iof portlons of the drum being broken awa ln the practice of the invention the drum in which reduction is eected, consists of a cylindrical casing 1 having one endclosed by a head. 2 protected against abrasion by end liners 2E* and having a hollow trunnion 3 through which material to be reduced is fed into .the drum. Provision .should be made for reventing the escape of Huid from the dr through the trunnion through which 'the fuel is fed to the drum. While any suitable means may be employed for this purpose, it is preferred to employ the construction shown in the application above; referred to, which consists of a -positively driven screw 4 arranged in 'the hollow trunnion to which the material 1s supplied from the hopper in such quantities as to maintain.

the trunnion fully charged. At its opposite end the casing 1 which is preferably made of sheet metal, has secured thereto a ring or tire 5 adapted to ride on rollers during the rotation of the drum, by a driven pinion engaging the annular toothed member 8 secured to the head 2 of the drum, as in the application above referred to. The casing serves as a retaining member for annularl liners 9 so constructed as to form in connection with the casing a plurality of passages 1 0 extending longitudinally of the drum. rihe an nular liners are retained in such relation to each other 'by suitable means that continuous passages are formed from end to end oi the drum. hese passages are closed at one end by the head 2. rlhe annular liners are held within the drum by a head 11 secured to the casing and having openings 12 adjacent lto the periphery of the head and adapted when the head is in position to register with the passages 10 of the liners. As it is desired that the fluid should iiow from and into the passages 10 in directions approximately at right angles, to the radii of the drum, the innerwall of the liners have approximately radial portions 13 through which are formed perforations 14. Attached to or made integral with the outer side of the head 11 are a series of radial vanes 42 spaced to form a number of channels radiating from the center -and corresponding in number to the peripheral openings 12. The outer walls of these channels are formed by a hood 44 which has its one end attached to the rotatingf drum in any suitable manner and the opposite end is provided with an opening which registers with the inner open end of the dis fr tributing head B.y This head is provided on one side with an inlet nozzle 35 for air and on the opposite side with;a an outlet nozzle 36 for piilverized material. Suitable means are employed for forming a tight joint between the hood 44 and the inner end of the head which is stationary. Within the disfributing head is arranged an adjustable partition or shutter 37 whose axis of rotation 'coincides with the axis of the distributing head. This shutter extends the full length of the distributor dividing the interior into an inlet channel 38 and an outlet channel 39. In the construction shown these two channels are made of equal transverse dimensions but can be made of diderent transverse dimensions by changing the angular relation of the position of the blades of the shutter on op posite sidescf its axis of rotation. in the construction shown, these wings or blades are at an angle of 180 degrees from each other. The portion of this shutter within the distributing head is made adjustable by means for connecting the ports in communimeans of a shaft 40 and a. crank 41.

In the operation of this improved pulverizer, the air will enter through the inlet ports 35, flow along the channel 38 on one side of the shutter and enter channels 43 and passing along the same, flow through the port 12 along the channels 10 and out through the perforations into 'the drum. The air flows through the interior of the drum Where it becomes laden with fine material and Will leave the drum through ports 14 and passages 10 which are connected by channels to the outlet passages or channels 39 on the op posite sideof the shutter.

It Will be readily vunderstood that Aby the adjustment of the shutter the air Will be made to enter the drum through any desired sector and leave the drum through any other desired sector, Which Asector may be so locatedthat the air will have to pass through the charge contained in the drum before escaping through the ports 14 and passages 1,0.

I claim herein .as my invention:

l. A pulverizing mill having in combination a drum, one of the heads provided with a plurality of ports, a distributing head provided With inlet and outlet passages communicating with said drum and adjustable cation with the drum with the passages in distributing head.

2. A ulverizing mill having in combination a rum'having a plurality of ports at one end, a plurality of radial passages connected at one end to said ports, a distributing head communicating .with ,the inner ends of said passages and provided With inlet and outlet passages communicating With said drum, and a shutter for controlling the connection of the passages in the head with the radial passages.

3. A pulverizing mill having in combination a drum provided with a plurality of passages extending longitudinally of the drum, a hood enclosing an end of the drum and spaced from the head of the drum, vanes interposed between the hood andthe head of the drum forming radial passages communicating with the passages in the drum, a distributing head communicating with the inner ends of the radial passages, a movable shutter adapted to divide the head into two compartments, and supply and discharge pipes connected to the head at points on opposite sides of the shutter.

In testimony whereof, I have hereunto set my hand.

RALPH E. H. POMEROY. 

